I am having trouble getting good performance out of the AD5791 using the Analog Devices eval board. I populated the empty third of the board with an LTZ1000a voltage reference and theother components, and am controlling the DAC with a microcontroller through the SPI pins on the board. I have no trouble communicating with the DAC, but the output is very noisy.
I recently constructed a similar setup for the AD5764 eval board, and have no problems--that DAC performs well, with minimal noise on the output. But with the AD5791, the output noise is many many times larger than one LSB equivalent. I was wondering about details of the testing that generated the performance listed in the data sheet. Is it with the Linear technologies reference or an external one? I suspect the voltage reference is the problem, and would appreciate any help in getting it to work.